Burkert 8185 Mise En Service page 11

Type of vessel
LEVEL TRANSMITTER 8185 - 4 ... 20 mA/HART
Plastic vessel
The guided microwave principle requires a metal surface on
the process fitting. Therefore use in plastic vessels etc. an
instrument version with flange (from DN 50) or place a metal
sheet (ø >200 mm/8 in) beneath the process fitting when
screwing it in.
Make sure that the plate with the process fittings has direct
contact.
In bypass tubes of plastic, a metal screening must be provided
from outside. You can glue, e.g. metal foil from outside to the
complete tube length. This metal screening must be con-
nected to the ground connection of the instrument.
When installing rod or cable probes without metal vessel wall,
e.g. plastic vessel, the measured value can be influenced by
strong electromagnetic fields (emitted interference according
to EN 61326: class A).
In this case, use a probe in coax version.
Fig. 4: Installation in plastic silo
1 Flange
2 Metal sheet
Concrete vessel
When installed in thick concrete ceilings, LEVEL TRANS-
MITTER 8185 should be mounted front flush to the lower edge.
In concrete silos, the distance to the wall should be at least
500 mm (20 in).
1
Mounting
2
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